There is no one answer. You should flush till you are free of stones 3x in a row, but as a guess I would say after 8-10 flushes you might feel better.
You are lucky that after one you already feel improvement.

7 flushes in 4 months. This last flush I got 1 big stone out along with a bunch of pea sized. But I think it's this big one that was bothering me all along, cause since the last few days I am feeling so much better. More Fiber is also what I needed.

Its hard to say. I saw some improvement after most of the flushes but not always.
Sometimes it seemed the flushes got some stuff out, but also moved stuff down and blocked me even more. The biggest improvement I ever had was after flush 5 when I got out my first BIG one. A square inch ROCK hard white stone. I felt something change immediately, it felt like a river of bile and energy free flowing through my liver when I didnt realize there was a dam there before. It also released a ton of toxins so I had that to deal with after the immediate feel good effects.

Now Im almost ready to do flush 8, but its odd, I dont get stones anymore, except I still feel blocked. I have a feeling there are probably more in there but they are old and jammed in and not coming out. Im doing the Iodine program now as well which is supposed to help melt down stones and increase circulation through the liver area. Maybe that will help with my flushes. With these last ones, it hasnt felt like bile flow has really increased, because Im not getting stones out, it more feels like my liver is being "rinsed" every time and that helps detox somewhat.

I dont really think I said anything that was of that much help, just that Im not done yet, and I guess you just keep flushing til you start feeling better, and even then, keep flushing! :)